KR100804747B1 - Printer - Google Patents

Abstract

A printer is provided to move a work stage in X, Y and theta axes with ease in order to align a substrate and effectively prevent the work stage from being arbitrarily moved by pressure of a blanket roll during a printing work, thereby preventing deterioration of print quality. A work stage(50) supports a substrate for a printing work for at least one pattern among substantial RGB(Red, Green and Blue) patterns for the substrate. A blanket roll(40) is contacted and suppressed onto the surface of the substrate for the printing work. A push preventing unit(90), which is installed in front of the work stage about the direction in which the blanket roll progresses, prevents the work stage from being pushed by pressure of the blanket roll during the printing work.

Description

Print Device {Printer}

1A and 1B are diagrams showing two types of structures of color filter layers printed with R, G, and B patterns, respectively.

2 is a schematic structural diagram of a printing apparatus according to an embodiment of the present invention.

FIG. 3 is a schematic perspective view of the work stage region shown in FIG. 2.

4 is a partial cross-sectional view taken along line IV-IV of FIG. 3.

5 is a schematic partial plan view of FIG.

FIG. 6 is a view schematically showing an operation of the rolling prevention part shown in FIG. 5.

7 is a schematic planar projection view of a work stage excluding a rolling prevention part in a printing apparatus according to another embodiment of the present invention.

FIG. 8 is an enlarged perspective view of area A of FIG. 7.

9 is a cross-sectional view taken along the line VII-VII of FIG. 8.

FIG. 10 is a diagram illustrating a state in which the work stage of FIG. 7 is moved along the X axis.

11 is a diagram illustrating a state in which the work stage of FIG. 7 is moved on the Y axis.

12 is a diagram illustrating a state in which the work stage of FIG. 7 is rotated along the θ axis.

* Explanation of symbols for the main parts of the drawings

10: gravure roll 10a: groove

12: support 20: doctor blade

22: knife 30: dispenser

40: blanket roll 45: work table

50: work stage 58: support plate

60a, 60b: detection part 62a, 62b: gantry part

70: stage moving support unit 70a ~ 70d: moving support unit

71a ~ 71d: Motor 72a ~ 72d: Ball Screw

73a ~ 73d: Rotating support 74a ~ 74d: Moving block

75a ~ 75d: Rail 76a ~ 76d: Intersecting Block

77a ~ 77d: Fixed part 82: Height adjusting part

85: probe unit 90: anti-roll

91: contact block 91a, 92a: inclined surface

92: support block 95: gap measurement unit

The present invention relates to a printing apparatus, and more particularly, to a printing apparatus capable of preventing the work stage from being pushed due to the pressing force of the blanket roll during the printing operation on the substrate, thereby maintaining excellent print quality.

Recently, the flat panel display (FPD) has begun to emerge as the electronic display industry has developed rapidly among the semiconductor industry. Flat panel displays are commonly used as monitors for TVs or computers, or as display devices for devices such as mobile phones, PDAs, and digital cameras. Types of flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light emitting diodes (OLEDs).

A flat panel display typically has a color filter layer for realizing color. A color filter having a black matrix for preventing light from leaking to areas other than the image display area and degrading the image quality of the display device is formed. It is provided.

A typical flat panel display having such a color filter is the LCD described above. The LCD includes a thin film transistor substrate on which a thin film transistor is formed, a color filter substrate on which a color filter layer is formed, and a liquid crystal filled between these substrates.

In the color filter layer, as shown in Figs. 1A and 1B showing two types of color filter layers in which R, G, and B patterns are printed, respectively, R (Red), G (Green), and B (Blue) are typically used. A pixel having a pigment of the pattern is formed. Each pixel may consist of sub-pixels having R, G, and B, but in general, each pixel has one pigment.

In forming the color filter layer, as shown in FIG. 1A, the R, G, and B patterns may be regularly arranged in a line such that the R, G, and B patterns are arranged in the same column, respectively, or as shown in FIG. 1B. Similarly, R, G, and B patterns may be repeatedly arranged in the same row. Depending on the arrangement of the R, G, and B patterns, various resolution differences can be realized.

Such a color filter layer can be produced by various methods, for example, dyeing, printing, electrodeposition, pigment dispersion. STN (Super Twisted Nematic) LCD, which is one of the conventional passive matrix methods, mainly produces color filter layers by dyeing, printing, and adhesive methods, but it is an active matrix method that has excellent elaboration, good reproducibility, and is applicable to large-area liquid crystals. In TFT (Thin Film Transistor) LCD, pigment dispersion method is mainly used.

In the pigment dispersion method, a color filter layer is produced by forming a pattern of photosensitive color resist by a general photo process. That is, the color filter layer is completed by applying a photosensitive color resist on a substrate, irradiating light using a mask, and then applying a developer to form a desired pattern.

As such, a photo process is required to form a color filter by the pigment dispersion method, and this photo process causes a problem that the process is not only complicated but also expensive to manufacture. Furthermore, the process is further complicated since the photo process must be repeated three times in order to form pixels corresponding to the dyes of the R, G, and B patterns.

Recently, a method of using the printing method in the TFT LCD field has been proposed to overcome the problems of the pigment dispersion method.

The printing method includes a gravure filled gravure and a corresponding roll to form a color resist pattern of the dye on the substrate by the action of a roll, and then another color color resist by another roll. To form sequentially. That is, after applying R, G, B color resist (color ink, color pigment) on the outer surface of the gravure roll, a blanket roll is applied to the outer surface of the gravure roll or gravure plate. R, G, and B color resists are transferred from the gravure roll to form the R, G, and B patterns on the substrate by the action of the blanket roll after the blanket roll is transferred.

If such a printing method can be put into practical use, the process of manufacturing a color filter layer by printing R, G, and B patterns on a substrate can be performed more quickly and effectively. However, an apparatus capable of manufacturing a color filter layer using such a printing method (hereinafter, Printing device) has not been put to practical use. Therefore, research and development for such a printing device is actively in progress.

In the case of the printing apparatus that has been researched and developed so far, when the substrate loaded on the work stage on which the printing work is going to be aligned with the blanket roll, freeze the substrate alone on the work stage upper surface. It is known to move the work stage itself to the X, Y and θ axes since it cannot be reduced. This is because even if the substrate is aligned on the work stage, the already aligned substrate may be twisted again when the substrate is completely adhered to the upper surface of the work stage and adsorbed for printing. In this way, in order to align the substrate while moving the work stage itself in the X-axis, Y-axis, and θ-axis, the work stage is equipped with structures for moving the work stage while supporting the work stage.

On the other hand, as the preference for large TVs of 40 inches or larger and large monitors of 20 inches or larger has increased in recent years, manufacturers of LCDs have a width of 2 meters (m) in width and length to produce wider substrates. Research to increase the size of the substrate to the above eight generations is underway, and practical commercialization is expected soon.

Therefore, the size, volume, and weight of the work stage and the blanket roll and the like provided in the printing apparatus for processing such a large area substrate are inevitably huge.

In particular, in the case of the work stage supporting the substrate, since the huge blanket roll is directly pressed, the work stage is moved to the X-axis, Y-axis, and θ-axis to complete alignment of the substrate. The work stage should not move arbitrarily. In other words, during the printing operation on the substrate, the sliding phenomenon such as the work stage is partially rotated should not occur.

However, as described above, the blanket roll has to be huge in order to process a large-area substrate, and thus, the pressure applied to the work stage is inevitably increased. It is expected to be difficult to prevent the stage from being pushed back. If the work stage is pushed during printing, alignment of the substrate cannot be maintained accurately, which inevitably affects the print quality of the substrate. Therefore, during the printing operation, the development of a new structure is required to prevent the work stage from being pushed by the pressing force by the blanket roll.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing apparatus capable of preventing the work stage from being pushed by the pressing force of the blanket roll during the printing operation on the substrate, thereby maintaining excellent print quality.

The object is, according to the present invention, a work stage for supporting a substrate for a printing operation on at least one of a substantially R (Red), G (Green), and B (Blue) pattern for the substrate. ); A blanket roll press contacted to the surface of the substrate for the printing operation; And an anti-rolling part provided in at least one region of the work stage and preventing the work stage from being pushed by the pressing force of the blanket roll during the printing operation.

Here, the rolling prevention part may be provided on the front surface of the work stage with respect to the direction in which the blanket roll proceeds.

The anti-rolling portion, the contact block that one side is in contact with the front surface of the work stage; A support block disposed in contact with the other side of the contact block to pressurize and support the contact block; And it may include a block driving unit for driving the support block.

An inclined surface may be formed on each surface of the contact block and the support block that the contact block and the support block contact.

The block driving unit may be coupled to the support block to drive the support block in an intersecting direction crossing the direction in which the blanket roll proceeds during the printing operation.

The block driving unit may include a servo motor rotatable in a forward and reverse direction; And one end may be coupled to the motor shaft of the servo motor and the other end may include a ball screw coupled to the support block.

It may further include a bracket portion for supporting the support block and the servomotor.

A gap measuring unit measuring a gap between the work stage and the contact block; And a motor controller configured to control driving of the servo motor based on the value measured by the gap measurer.

The gap measuring unit may be detachably coupled to the dummy protrusion formed on one side of the contact block.

The anti-rolling portion may be provided in plurality in spaced apart from the front of the work stage.

The printing apparatus includes a sensing unit provided around the work stage to sense a relative alignment position of the substrate with respect to the blanket roll; A stage moving support unit coupled to a lower portion of the work stage and provided on a plate surface of the work stage to support the work stage to be movable in a plate direction of the work stage; And a controller configured to control movement of the stage movement supporter based on the signal of the detector.

The lower surface of the work stage may further include a support plate which is provided in parallel with the work stage spaced apart from the work stage, wherein the stage moving support portion in a state in which at least a portion is coupled to the lower surface of the work stage It may be disposed on the upper surface of the support plate in a substantially rectangular composition spaced apart from each other.

The stage moving support unit may include four moving support units respectively provided at four corner regions of the upper surface of the support plate.

Each of the four moving support units includes a motor controlled by the controller; A ball screw coupled to the motor and rotatable in a forward and reverse direction by the motor; A rotation support part provided on an opposite side of the motor with the ball screw therebetween to rotatably support an end of the ball screw; A moving block coupled to the ball screw and movable along the longitudinal direction of the ball screw when the ball screw rotates; At least one rail provided on an upper surface of the support plate to guide the movement of the movable block; An intersecting block coupled to the moving block and freely moving in a direction crossing the moving block; And both ends may include a fixing part fixed to the upper surface of the cross-block and the lower surface of the work stage, respectively.

Each of the four moving support units includes: a plurality of protrusions protruding upward from an upper surface of the moving block and having through holes formed therein; And a moving shaft movably coupled to the protrusion to pass through the through hole, and at least a portion of which is fixed to the cross block.

Ball screws respectively formed on the four moving support units are arranged in substantially the same direction as those arranged in the diagonal direction on the upper surface of the support plate, the motor provided in the moving support units disposed along the diagonal direction They can be located in opposite directions.

A moving rotary part coupled to both sides of the blanket roll and configured to move and rotate the blanket roll to an upper surface of the work stage; And a pair of gantry portions which are partially coupled to the movable rotation part and move together with the movable rotation part to the upper surface of the work stage, and are spaced apart from each other in front of the blanket roll, wherein the sensing unit is a pair Is provided in each of the gantry portion, it can be coupled to be movable along the longitudinal direction of the gantry in the gantry.

The sensing unit may include an alignment camera for photographing an alignment mark formed on the substrate and transmitting the captured image information to the controller.

It may further include a height adjusting unit coupled to the support plate to adjust the height of the support plate including the work stage.

It may further include at least one probe unit provided around the height adjustment unit for measuring the lifting height of the support plate.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

2 is a schematic structural diagram of a printing apparatus according to an embodiment of the present invention.

As shown in this figure, the printing apparatus according to an embodiment of the present invention, the gravure roll (10, Gravure roll), the outer surface of the gravure roll 10 R (Red), G (Green), B ( Blue) Dispenser 30 for applying any one of the color resists (color ink, color pigment) and doctor blade for removing unnecessary color resists among the color resists applied to the outer surface of the gravure roll 10 ( 20, Dr. Blade) and any one of R, G, and B color resists are transferred from the gravure roll 10 to R, G, and B on the surface of the color filter substrate (hereinafter referred to as substrate G). A blanket roll 40 for printing any one of the patterns, a work stage 50 for printing a pattern of any one of R, G, and B patterns on the substrate G; The work table 45 which transfers the board | substrate G to the upper surface of the work stage 50, and supports these A lower base 60 is provided.

The gravure roll 10 serves to transfer any color resist selected from R, G, and B color resists to the outer surface of the blanket roll 40. Thus, the gravure roll 10 and the blanket roll 40 have substantially similar volumes. The gravure roll 10 is rotatable in a corresponding position by a roll driving part (not shown) coupled to a pair of left and right support parts 12 fixed to the lower base 60 and standing upright. The gravure roll 10 may be directly coupled to the roll driving unit, or may be coupled to the roll driving unit through a separate pocket (not shown). When the pocket is provided, there is an advantage that the replacement operation of the gravure roll 10 is easy as well as the eccentricity and the horizontal axis of the gravure roll 10 can be easily adjusted.

For reference, as described above with reference to FIGS. 1A and 1B, in printing the R, G, and B patterns on the substrate G, the R, G, and B patterns may not be simultaneously printed on the substrate G through one printing apparatus. Do not. That is, in order to print the R, G, and B patterns on the substrate G, at least three printing apparatuses are provided, and each of the R, G, and B patterns is selected and printed on the substrate G by the three printing apparatuses. .

Therefore, the dispenser 30 which first applies the color resist to the outer surface of the gravure roll 10 by the dispenser 30 has only one color resist selected from the R, G, and B color resists on the outer surface of the gravure roll 10. Will be applied. Expressed easily, the dispenser 30 applies only ink of any color selected from red, green and blue to the outer surface of the gravure roll 10.

Although not shown in detail, the outer surface of the gravure roll 10 is formed with a concave-convex pattern substantially covered with color resist (coated). At this time, the uneven pattern may be embossed or engraved. In the embossed form, the color resist is applied to the outer surface of the protruding convex and concave portion (not shown) to transfer to the blanket roll 40. In the engraved form, the color resist is applied to the inside of the recessed recess 10a. Transition to (40).

However, the blanket roll 40 receives the color resist from the outer surface of the gravure roll 10 and retransfers (prints) it onto the substrate G to form R, G, and B patterns having a shape as shown in FIGS. 1A and 1B. In this case, in order to maintain the thickness of the R, G, and B patterns uniformly from the surface of the substrate G, it may be advantageous that the uneven pattern formed on the outer surface of the gravure roll 10 has a negative shape.

When any of the color resists selected from R, G, and B color resists is applied to the outer surface of the gravure roll 10 by the dispenser 30, as shown in the enlarged portion B of FIG. The color resist should be applied only to the groove portion 10a. However, when the dispenser 30 applies the color resist to the outer surface of the gravure roll 10, it is difficult to apply the color resist at a time such that the color resist is selectively received only in the recess portion 10a of the substantially engraved shape.

Therefore, when the dispenser 30 applies the color resist to the outer surface of the gravure roll 10, the color resist is widely spread on the outer surface of the gravure roll 10 and applied, and when the application is completed, the recess 10a of the intaglio shape is completed. By removing the unnecessary color resist applied to the remaining surface 10b, the color resist is finally contained only in the recess 10a. To this end, the doctor blade 20 is provided in the periphery of the gravure roll 10 to remove unnecessary color resist.

The doctor blade 20 includes a knife holder 21 and a knife 22 coupled to the knife holder 21. The knife holder 21 has a structure that can be easily attached and detached at a predetermined position of the support 12 in this embodiment in a one-touch form. The knife 22 has a length substantially similar to the length of the gravure roll 10, and the tip of the gravure roll 10 in the state where the tip is in contact with the outer surface of the gravure roll 10 (actually there is a slight gap). It is disposed to be inclined with respect to the outer surface serves to scratch the outer surface of the gravure roll (10).

In this way, since the tip of the knife 22 is in contact with the outer surface of the gravure roll 10, when the color resist is applied to the outer surface of the rotating gravure roll 10, the recess 22 of the intaglio form by the knife 22 The color resist applied to the remaining surface 10b except for) may be naturally removed. Therefore, finally, the color resist can be accommodated only in the recess 10a (see FIG. 2B).

As described above, the dispenser 30 serves to apply color resist to the outer surface of the gravure roll 10. The dispenser 30 is provided to be movable along the longitudinal direction of the gravure roll 10 as well as to be able to be lifted or folded in one direction at the corresponding position. Therefore, the coating efficiency of the color resist can be improved, and interference with the surrounding structure can be avoided.

The blanket roll 40 is rotated by transferring the color resist applied in the groove portion 10a formed on the outer surface of the gravure roll 10, and more particularly, on the outer surface of the gravure roll 10. And a substantially printing roll for printing the R, G, and B patterns as shown in FIG. 1B.

On the outer surface of the blanket roll 40, a sheet to which the color resist is transferred from the gravure roll 10 is wound. Of course, the sheet used more than the number of times the appropriate limit has to be replaced, so the blanket roll 40 is further provided with a sheet replacement means (not shown) for easy replacement of the sheet. The sheet replacement means serves to provide a certain tension to the sheet so that the sheet can be easily replaced, while the sheet is unfolded and stretched and wound on the outer surface of the blanket roll 40. The sheet replacement means is provided on one surface 40a (see FIG. 2) cut off from the blanket roll 40.

The blanket roll 40 must be accessible and spaced apart from the gravure roll 10 as well as able to rotate on the top surface of the substrate G loaded on the work stage 50. To this end, both sides of the blanket roll 40 on the side rails 61 of the lower base 60 to move the blanket roll 40 in a linear direction, as well as to move the rotary roll to rotate the blanket roll 40 at the corresponding position ( 42). The structure for moving the blanket roll 40 in the moving rotation part 42 may be, for example, a linear motion or the like capable of precise control.

The work table 45 plays a role of transferring the substrate G to the work stage 50 where the printing operation of the R, G, and B patterns on the substrate G is performed. In other words, the work table 45 is a conveying means for conveying the substrate (G).

As described above, since the process operation using the 8th generation substrate G having a width and a width of 2 m or more in the roots is performed, it is difficult to transfer the substrate G by a simple adsorption method. . Therefore, as an alternative, the substrate G must be transferred after the substrate G is floated, and this manner is applied to the work table 45.

That is, a plurality of air floating holes (not shown) are formed on the surface of the work table 45, which may be manufactured as a substantially square plate, in which air for injecting the substrate G is floated. In addition, a plurality of air exhaust holes (not shown) are ejected toward the substrate G to lift the backflow by hitting the substrate G to float the substrate G in order to float the air floating holes. have. Unlike the work stage 50, the work table 45 may be made of a metal material, for example, aluminum or stainless steel.

3 is a schematic perspective view of the work stage region shown in FIG. 2, FIG. 4 is a partial cross-sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a schematic partial plan view of FIG. 6 is a view schematically showing an operation of the rolling prevention part shown in FIG. 5.

Referring to these drawings, the work stage 50 is a place where a printing operation of the R, G, and B patterns on the substrate G proceeds. While the work table 45 is formed of a metal material, the work stage 50 may be made of a stone slab instead of a metal material. When used as a work stage 50 as a stone slab, strict dimensional control is possible, and there will be an advantage of not causing particle defects due to friction with the substrate G.

A tiled air line 50a is formed on the surface of the work stage 50. An air floating hole 53 is formed on an intersection point at which the tiled air line 50a crosses each other or the tiled air line 50a, and the porous air guide member 76 is formed in each air floating hole 53. Is combined. Of course, instead of the tiled air line 50a, only a plurality of air buoys 53 may be formed.

A plurality of partitions 54 are formed on the bottom of the work stage 50 to which the porous air guide member 76 is coupled to partition the air injection holes 53 into a plurality of groups. The partition 54 is formed by the depression 54 recessed in the direction from the bottom of the work stage 50 to the top surface. In each of the partitions 54, air supply lines 55 that are individually controlled from each other are disposed.

For reference, the substrate G is transferred to the work stage 50 in the injured state without contacting the surface (upper surface) of the work table 45 on the work table 45, but in the injured state in the work stage 50. Although the substrate G is delivered, the substrate G is adsorbed onto the surface of the work stage 50 when a printing operation is performed. Therefore, air may be injected through the tiled air line 50a, or air may be adsorbed on the contrary.

In the lower region of the work stage 50, a support plate 58 is provided to be parallel to the work stage 50 at a distance from the work stage 50. The support plate 58 provided on the upper portion of the lower base 60 forms a reference surface for moving the work stage 50 along the X, Y, and θ axes.

On the other hand, at least one area of the work stage 50 is provided with a rolling prevention unit 90 for preventing the work stage 50 from being pushed by the pressing force of the blanket roll 40 during the printing operation.

Such a rolling prevention part 90 may be provided in substantially any one area | region of the work stage 50, since what is necessary is just to prevent the work stage 50 from being pushed arbitrarily even if the pressing force of the blanket roll 40 is provided. In the present embodiment, the printing roll is provided on the front surface of the work stage 50 with respect to the direction in which the blanket roll 40 advances, but the present invention is not limited thereto. Detailed description of the jungle prevention portion 90 is as follows.

The anti-rolling part 90 is provided in a pair in the front left and right areas of the work stage 50. Thus, by providing a pair of rolling prevention part 90, the phenomenon in which the work stage 50 is arbitrarily pushed can be prevented more reliably. However, if the size and structure of the anti-rolling portion 90 is improved within the scope of the present invention, it is not necessary to provide two anti-rolling portions 90 as shown. Therefore, the number and position of the anti-rolling portion 90 may be appropriately changed in design as necessary.

The anti-rolling part 90 largely includes a contact block 91, a support block 92, and a block driving part 93. In the drawings, the contact block 91 and the support block 92 have a substantially trapezoidal shape hatched, and these are represented as blocks, but the contact block 91 and the support block 92 are substantially movable structures. Therefore, it may be expressed as a slider.

The contact block 91 is provided on the front of the work stage 50. One side (not shown) of the contact block 91 is substantially in contact with the front surface of the work stage 50, the other side inclined surface (91a) is inclined contact with the inclined surface (92a) of the support block 92.

On one side of the contact block 91, a dummy protrusion 91b is formed in a direction parallel to the ball screw 93b to be described later. The gap measuring unit 95 is coupled to the dummy protrusion 91b. The gap measuring unit 95 is a kind of distance sensor and measures a gap H (see FIG. 6) between the front surface of the work stage 50 and one side (not shown) of the contact block 91.

That is, since the anti-rolling part 90 serves to support the work stage 50 so that the work stage 50 is not pushed, the work stage 50, the contact block 91 and the support block 92 are always Should be in contact. However, the front surface of the work stage 50 and the contact block due to reasons such as setting or replacing the work stage 50 or the anti-rolling part 90 in the printing apparatus or other causes or abnormalities such as vibration. A gap H may occur between one side of the 91. The gap H generated may be measured by the gap measurement unit 95. If the gap H is generated, the value measured by the gap measuring unit 95 is sent to a motor control unit not shown, and the motor control unit controls the driving of the servo motor 93a which will be described later to support the support block 92. By pressing the contact block 91 through, one side of the contact block 91 can always be in contact with the front surface of the work stage (50).

The support block 92 is provided in front of the contact block 91 in contact with the contact block 91. As described above, the inclined surface 92a is formed on one side surface of the support block 92 to be inclined to the inclined surface 91a which is the other side of the contact block 91. The support block 92 is moved to the work stage 50 side or the opposite direction by the block drive unit (93).

The block driving unit 93 is coupled to the support block 92 and serves to directly drive the support block 92. The block driving unit 93 is coupled to the support block 92 to drive the support block 92 in the cross direction intersecting the direction in which the blanket roll 40 travels. That is, referring to FIGS. 5 and 6, the block driving unit 93 is coupled to the side of the support block 92.

The block driving unit 93 is a servo motor 93a controlled to be rotatable in the forward and reverse directions by the above-described motor control unit, one end is coupled to a motor shaft (not shown) of the servo motor 93a, and the other end thereof is a support block ( 92 is coupled to the ball screw (93b). At this time, the support block 92 and the servomotor 93a are supported by separate brackets 94.

Briefly describing the operation of the jungle prevention unit 90 having such a configuration is as follows.

First, in the reference state as shown in FIG. 5, the work stage 50 or the rolling prevention unit 90 may be set or replaced with another one, or because of an abnormal cause such as vibration, etc. When a gap H (see FIG. 6) occurs between the front surface and one side of the contact block 91, the gap measuring unit 95 measures the gap H and sends this information to the motor control unit.

Then, the motor control unit controls the rotation of the servomotor 93a based on the information sent from the gap measuring unit 95. As shown in FIG. 6, when the thermomotor is operated to rotate the ball screw 93b in one direction, the ball screw 93b is extended to press the support block 92. At this time, since the contact block 91 and the support block 92 are disposed to be inclined, when the support block 92 is pushed by the ball screw 93b, the contact block 91 is formed by the inclined surfaces 91a and 92a. It can be moved to the 50 side. Accordingly, the contact block 91 initially moves by the gap H formed between the front surface of the work stage 50 and one side surface of the contact block 91 and comes into contact with the work stage 50 again as shown in FIG. 5. When the work stage 50, the contact block 91 and the support block 92 are in contact with each other, as shown in FIG. 5, the printing operation is performed by the blanket roll 40 in this state. In this case, the giant blanket roll 40 is Even if the work stage 50 is pressed, the sliding phenomenon of the work stage 50 can be prevented.

As described above, according to the present exemplary embodiment, the work stage 50 may be prevented from being pushed by the pressing force of the blanket roll 40 during the printing operation on the substrate G. As shown in FIG.

On the other hand, Figure 7 is a schematic planar projection of the work stage excluding the slipper in the printing apparatus according to another embodiment of the present invention, Figure 8 is an enlarged perspective view of the area A of Figure 7, Figure 9 is a -It is sectional drawing along x-ray, FIG. 10 is a figure which shows the state which the work stage of FIG. 7 moved to the X axis, FIG. 11 is a figure which shows the state which the work stage of FIG. 7 moved to the Y axis, 12 is a diagram illustrating a state in which the work stage of FIG. 7 is rotated along the θ axis.

For reference, in the case of the printing apparatus to be described below, the anti-rolling unit 90 described in the above embodiment is provided, but for the convenience of description, the anti-rolling unit 90 except for both the drawings and the description will be described. Only the description will be given. The remaining configurations mainly correspond to a so-called four-point support structure that can be supported while moving the work stage 50.

Referring to FIGS. 7 to 12, the printing apparatus of the present embodiment performs the function of supporting the work stage 50 while moving the work stage 50 itself to the X-axis, Y-axis, and? Can be equipped to perform alignment for. That is, in order to align the substrate G with respect to the blanket roll 40 forming the reference of the print job, the sensing units 60a and 60b, the stage moving support units 70 (see FIGS. 2 and 3) and the control unit ( Not shown).

The sensing units 60a and 60b are disposed in the periphery of the work stage 50, more specifically, in the front region of the blanket roll 40 to adjust the relative alignment position of the substrate G with respect to the blanket roll 40. Detect. The detection unit 60a, 60b is a pair of parts coupled to the moving rotary part 42 for rotating the blanket roll 40 while moving along the work line W shown by the dotted lines in FIGS. 10 to 12. It is provided in the gantry parts 62a and 62b. One end of the gantry 62a, 62b having a rod shape is coupled to the movable rotation part 42, so that when the movable rotation part 42 moves along the work line W, the gantry parts 62a, 62b also work. Can move along line W.

The pair of gantry portions 62a and 62b are provided with sensing portions 60a and 60b, respectively, and the sensing portions 60a and 60b are movably coupled along the length direction of the corresponding gantry portions 62a and 62b. do. The sensing units 60a and 60b individually photograph the alignment marks G1, G2 and align marks formed on the substrate G, and transmit the captured image information to the controller. In the present embodiment, the sensing units 60a and 60b are applied to the alignment cameras 60a and 60b, but the present invention is not limited thereto.

For reference, since the position information of the substrate G is previously input to the controller, the alignment marks G1 formed on the substrate G at the corresponding positions by the alignment cameras 60a and 60b as the sensing units 60a and 60b. By taking G2) and sending the captured image information to the controller, the controller can compare these values to determine how much the substrate G of the print job target is distorted. When the degree of misalignment with respect to the substrate G is calculated, alignment of the substrate G can be performed by moving the work stage 50 in the X-axis, Y-axis, and θ-axis directions.

Here, the distance that the work stage 50 is moved in the X-axis, Y-axis and θ-axis directions is generally limited to within a few millimeters (mm). This is because the alignment cameras 60a and 60b for photographing the alignment marks G1 and G2 formed on the substrate G have high precision, so that the limit of the field of view (FOV) is determined. Therefore, the board | substrate G reached | worked to the work stage 50 is the board | substrate G already pre-aligned and conveyed to some extent by the work table 45 etc. which were the previous stage.

At least a portion of the stage moving support part 70 is coupled to a lower portion of the work stage 50, and is substantially rectangular in shape with respect to the plate surface of the work stage 50, thereby moving the work stage 50 to the plate surface direction of the work stage 50. (X-axis, Y-axis and θ-axis direction) to support the movement. As described above, the controller controls the movement of the stage movement supporting unit 70 based on the signals of the sensing units 60a and 60b.

Most of the stage moving support part 70 is coupled to the upper surface of the support plate 58, and only a part thereof is coupled to the lower surface of the work stage 50 to connect the support plate 58 and the work stage 50. . The stage moving support unit 70 includes four moving support units 70a to 70d respectively provided at four corner regions of the upper surface of the support plate 58. As a result, a position where four moving support units 70a to 70d are arranged is called a rectangular composition arrangement.

As such, when four moving support units 70a to 70d are arranged in four corner regions of the upper surface of the support plate 58, the four support members 70a to 70d have a more stable support structure than the three-point support type that can be expected. Although the large blanket roll 40 presses the work stage 50 at a high pressing force in the printing operation, the work stage 50 does not move arbitrarily. That is, the jungle can be minimized. Of course, the work stage 50 itself can be easily moved in the X-axis, Y-axis and θ-axis direction.

Hereinafter, for convenience of description, each of the four moving support units 70a to 70d will be referred to as the first to fourth moving support units 70a to 70d, respectively, in the counterclockwise direction based on the region A of FIG. 7. Let's explain.

Each of the first to fourth moving support units 70a to 70d is coupled to the first to fourth motors 71a to 71d and the first to fourth motors 71a to 71d to form a first to fourth motor ( The first to fourth motors 71a to 72d and the first to fourth ball screws 72a to 72d and the first to fourth ball screws 72a to 72d which are rotatable in the forward and reverse directions by 71a to 71d. 1st-4th rotation support parts 73a-73d provided in the opposite side of 71d) and rotatably supporting the edge part of 1st-4th ball screw 72a-72d, and 1st-4th ball screw 72a. First to fourth moving blocks 74a coupled to ˜72d and movable along the longitudinal direction of the first to fourth ball screws 72a to 72d when the first to fourth ball screws 72a to 72d are rotated. ˜74d) and first to fourth freely coupled to the first to fourth moving blocks 74a to 74d and freely moving in a direction crossing the direction in which the first to fourth moving blocks 74a to 74d move. Intersecting blocks 76a to 76d and first to fourth intersections at both ends The lock (76a ~ 76d) including first to fourth fixing part (77a ~ 77d) which is fixed to the lower surface of the upper surface and the workpiece carrier (50).

Each of the first to fourth motors 71a to 71d is independently controlled by a control unit. That is, as described above, when the degree to which the substrate G is distorted in the X-axis, Y-axis, and θ-axis directions is calculated, the controller individually controls the first to fourth motors 71a to 71d to independently control the first. The work stage 50 may be moved through the movement of the fourth to fourth moving blocks 74a to 74d and the first to fourth intersecting blocks 76a to 76d.

A plurality of first to fourth rails for guiding the movement of the first to fourth moving blocks (74a to 74d) on the upper surface of the support plate 58 for the stable movement of the first to fourth moving blocks (74a to 74d) 75a-75d are provided. Accordingly, a plurality of first to fourth moving blocks 74a to 74d moving along the longitudinal direction of the first to fourth ball screws 72a to 72d by the rotation of the first to fourth ball screws 72a to 72d. It is possible to stably move along the first to fourth rails (75a ~ 75d).

As described above, the first to fourth moving blocks 74a to 74d are moved by the operation of the first to fourth motors 71a to 71d. However, unlike the first to fourth moving blocks 74a to 74d, the first to fourth cross blocks 76a to 76d move freely on the first to fourth moving blocks 74a to 74d.

To this end, as shown in FIGS. 8 and 9, a plurality of protrusions 78a protruding upward from the upper surface of the first moving block 74a and having through holes 79a formed therein, and through holes A moving shaft 80a is movably coupled to the protrusion 78a so as to pass through the 79a, and at least a portion thereof is fixed to the first intersecting block 76a. Through this structure, the first intersecting block 76a may freely move along the longitudinal direction of the moving shaft 80a on the upper surface of the first moving block 74a. Here, the configuration of the protrusions 78a and the moving shaft 80a is provided in the second to fourth moving support units 70b, 70c, and 70d in addition to the first moving support unit 70a shown in FIGS. 6 and 7, respectively. However, for convenience, portions of the second to fourth moving support units 70b, 70c, and 70d will be omitted.

On the other hand, the work stage 50 can be more stably supported by arranging the first to fourth moving support units 70a to 70d at four corner regions of the support plate 58. However, in order to align the substrate G, the work stage 50 must move in the X-axis, Y-axis, and θ-axis directions, so an arrangement direction of each of the first to fourth moving support units 70a to 70d is also important. Acts as an element In the present embodiment, the first to fourth balls formed on the first to fourth moving support units 70a to 70d, respectively, to move the work stage 50 in the X, Y, and θ axis directions. Screws 72a to 72d are disposed in substantially the same direction as those arranged along the diagonal direction on the upper surface of the support plate 58, but the first to fourth moving support units 70a to 70d disposed along the diagonal direction. The first to fourth motors 71a to 71d provided in the field are positioned in opposite directions to each other. Due to this structural feature, the work stage 50 can be easily moved in the X-axis, Y-axis, and θ-axis directions.

Referring again to FIG. 3, the support plate 58 is further provided with a height adjusting portion 82 that is coupled to the support plate 58 and adjusts the height of the support plate 58 including the work stage 50. . Height adjusting portion 82 is implemented in the form of a screw to easily adjust the height of the support plate 58, including the work stage (50). At this time, in order to measure the lifting height of the support plate 58 which is lifted up and down by the height adjustment unit 82, one side of the support plate 58 so as to face the corresponding height adjustment unit 82 side. A plurality of probe units 85 are further provided.

A series of operations of the printing apparatus having such a configuration will be described below.

First, the substrate G starts entering the work table 45 by a separate transfer device. Then, the air is injected through the plurality of air floating holes formed in the work table 45, so that the substrate G enters the work table 45 with the predetermined height floating upward from the upper surface of the work table 45. As mentioned earlier, the substrate G entering the work table 45 is preliminarily aligned on the work table 45 by the front / rear and left / right alignment portions provided around the work table 45. Can be.

The substrate G floating on the upper surface of the work table 45 is transferred to the upper surface of the work stage 50 by a separate vacuum suction member. The vacuum suction member serves to transfer the substrate G to the work stage 50 in a state where the upper surface of the substrate G is adsorbed. Such a vacuum suction member may be mounted as a separate structure above the work table 45. At this time, since the air is injected into the work stage 50 through the tiled air line, the substrate G transferred onto the work stage 50 takes a state of being injured at a predetermined height on the upper surface of the work stage 50. do. Subsequently, when the injection process of the air is stopped, the injection of air is completed and the substrate G is loaded onto the upper surface of the work stage 50. Then, the air is adsorbed through the tiled air line, so that the substrate G is adsorbed on the upper surface of the work stage 50 to be fixed.

When the substrate G is fixed on the upper surface of the work stage 50 and adsorbed, a final final alignment process of the substrate G relative to the blanket roll 40 is performed. That is, the control stage moves and controls the first to fourth movable support units 70a to 70d by the information of the sensing units 60a and 60b provided in the periphery of the work stage 50, so that the work stage 50 has the X axis. , Y-axis and θ-axis are moved by a predetermined distance, thereby aligning the substrate G (see FIGS.

For example, when the work stage 50 needs to move a predetermined distance to the right side (X axis) as shown in FIG. 1 in the reference state as shown in FIG. 7, the controller operates the first and third motors 71a and 71c. The first and third ball screws 72a and 72c are rotated in one direction. Of course, the second and fourth motors 71b and 71d are not operated. Then, the first and third moving blocks 74a and 74c coupled to the first and third ball screws 72a and 72c have the right side of FIG. 9 along the first to third rails 75a and 75c below them. Go to. At this time, although the second and fourth moving blocks 74b and 74d positioned in the diagonal direction with the first and third moving blocks 74a and 74c are fixed, the upper portions of the second and fourth moving blocks 74b and 74d are fixed. The second and fourth intersecting blocks 76b and 76d provided at the second side may freely move to the right on the second and fourth moving blocks 74b and 74d. Therefore, the work stage 50 can move to the right as shown in FIG. 10 through this series of operating mechanisms.

In the case where the work stage 50 needs to move a predetermined distance to the upper side (Y axis) as shown in FIG. 11 in the reference state as shown in FIG. 7, the controller operates the second and fourth motors 71b and 71d at this time. The second and fourth ball screws 72b and 72d are rotated in one direction. Of course, the first and third motors 71a and 71c are not operated. Then, the second and fourth moving blocks 74b and 74d coupled to the second and fourth ball screws 72b and 72d are along the lower second to fourth rails 75b and 75d in the upper side of FIG. 10. Go to. At this time, the first and third moving blocks 74a and 74c located in the diagonal direction with the second and fourth moving blocks 74b and 74d are fixed, but the first and third moving blocks 74a and 74c are not fixed. The first and third intersecting blocks 76a and 76c provided in the upper portion may freely move upward on the first and third moving blocks 74a and 74c. Therefore, the work stage 50 can move upwards through the series of operating mechanisms as shown in FIG. 11.

If the work stage 50 needs to rotate in a clockwise direction by a predetermined angle (θ-axis) as shown in FIG. 12 in the reference state as shown in FIG. 7, the controller controls the first to fourth motors 71a to 71d at this time. Make everything work. When the first to fourth motors 71a to 71d operate, the first to fourth moving blocks 74a to 74d are moved by the operation of the first to fourth ball screws 72a to 72d that rotate in one direction. In addition, the first to fourth intersecting blocks 76a to 76d move freely in the corresponding directions on the first to fourth moving blocks 74a to 74d, and thus, according to their relative movement, the work stage 50 as shown in FIG. Can rotate a predetermined angle clockwise. 12 may be easily implemented by appropriately combining the operations of FIGS. 10 and 11, and thus a detailed description thereof will be omitted.

As such, when the work stage 50 is moved to the X-axis, Y-axis, Z-axis, and θ-axis by the control unit and the alignment operation on the substrate G is completed, the dispenser 30 may be used. The outer surface is coated with one color resist selected from R, G, and B color resists. At this time, since the tip of the knife 22 of the doctor blade 20 is in contact with the outer surface of the gravure roll 10, the knife 22 is applied to the outer surface of the rotating gravure roll 10 by the knife 22. Unnecessary color resist applied to the remaining surface 10b except the recessed portion 10a is removed. Therefore, finally, the color resist is accommodated only in the recess 10a.

When the color resist is applied to the outer surface of the gravure roll 10, the blanket roll 40 is moved toward the gravure roll 10 by the moving rotation part 42. When the blanket roll 40 is moved to contact the gravure roll 10, the color resist applied to the outer surface of the gravure roll 10 by the relative rotation between the gravure roll 10 and the blanket roll 40 is intact. It is transferred to the sheet wound on the outer surface of 40). After the color resist is transferred to the outer surface of the blanket roll 40, the blanket roll 40 is moved to the initial part of the work stage 50 by the moving rotation part 42 again.

Then, the blanket roll 40 prints any pattern selected from the R, G, and B patterns on the surface of the substrate G while moving and rotating the surface of the substrate G by the moving rotation part 42 (retransition). ) At this time, since the first to fourth moving support units 70a to 70d are squarely arranged to support the work stage 50 stably, even if the blanket roll 40 is pressed, the work stage 50 is pushed or moved arbitrarily. You will not. In addition, since the printing operation is performed by the blanket roll 40 in the state where the work stage 50, the contact block 91, and the support block 92 are in contact with each other, the sliding phenomenon of the work stage 50 is surely prevented. Since the substrate G is large and the blanket roll 40 is large, the rolling of the work stage 50 may be prevented, in particular, by the anti-rolling part 90, thereby maintaining excellent print quality on the substrate G. You can do it.

When the print job is completed, the blanket roll 40 is returned to its original position, and the substrate G having finished the print job is taken out and transferred to another printing apparatus for printing a different pattern among R, G, and B patterns, thereby performing the above-described process. Will repeat.

As such, according to the present embodiment, the work stage 50 can be easily moved to the X-axis, Y-axis, and θ-axis for alignment of the substrate G, as well as a blanket roll during printing. By the pressing force of 40, the work stage 50 can be effectively prevented from moving arbitrarily, thereby preventing the print quality from being lowered.

In the above-described embodiment, the blanket roll is used to transfer the color resist in the gravure roll, but instead of the gravure roll, a gravure plate having a rectangular plate shape is provided, and the blanket roll is a gravure plate. It may be possible to transfer color resist from the substrate.

In the above-described embodiment, the addition of the anti-rolling portion to the structure of the 4-point support is described, but the anti-rolling portion may be provided on the structure of the 3-point support.

As described above, the present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention, which will be apparent to those skilled in the art. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

As described above, according to the present invention, the phenomenon in which the work stage is pushed by the pressing force of the blanket roll during the printing operation on the substrate can be prevented, so that excellent print quality can be maintained.

Claims (20)

A work stage for supporting the substrate for printing on at least one of a substantially R (Red), G (Green), and B (Blue) pattern for the substrate; A blanket roll press contacted to the surface of the substrate for the printing operation; And And a pusher preventing portion provided in at least one region of the work stage and preventing the work stage from being pushed by the pressing force of the blanket roll during the printing operation. The method of claim 1, Wherein the anti-rolling portion is provided on the front surface of the work stage with respect to the direction in which the blanket roll travels. The method of claim 2, The rolling prevention part, A contact block having one side contacting the front surface of the work stage; A support block disposed in contact with the other side of the contact block to pressurize and support the contact block; And And a block driving part for driving the support block. The method of claim 3, And a slanted surface is formed on each surface of the contact block and the support block to which the contact block and the support block abut. The method of claim 4, wherein And the block driving part is coupled to the support block to drive the support block in an intersecting direction intersecting a direction in which the blanket roll proceeds during the printing operation. The method of claim 5, The block driving unit, A servo motor rotatable in the forward and reverse directions; And And a ball screw coupled to the motor shaft of the servo motor and coupled to the support block. The method of claim 6, Printing apparatus characterized in that it further comprises a bracket for supporting the support block and the servomotor. The method of claim 6, A gap measuring unit measuring a gap between the work stage and the contact block; And And a motor control unit for controlling the driving of the servo motor based on the value measured by the gap measuring unit. The method of claim 8, And the gap measuring unit is detachably coupled to the dummy protrusion formed on one side of the contact block. The method of claim 2, The rolling prevention unit is provided with a plurality of spaced apart from each other in front of the work stage. The method of claim 1, A sensing unit provided around the work stage to sense a relative alignment position of the substrate with respect to the blanket roll; A stage moving support unit coupled to a lower portion of the work stage and provided on a plate surface of the work stage to support the work stage to be movable in a plate direction of the work stage; And And a control unit for controlling the movement of the stage movement supporting unit based on the signal of the sensing unit. The method of claim 11, Further comprising a support plate provided in parallel with the work stage at a spaced interval from the work stage in the lower region of the work stage, And the stage moving support part is disposed on the upper surface of the support plate in a substantially rectangular composition so as to be spaced apart from each other while at least a portion thereof is coupled to the lower surface of the work stage. The method of claim 12, And the stage moving support unit includes four moving support units respectively provided at four corner regions of the upper surface of the support plate. The method of claim 13, Each of the four moving support units, A motor controlled by the control unit; A ball screw coupled to the motor and rotatable in a forward and reverse direction by the motor; A rotation support part provided on an opposite side of the motor with the ball screw therebetween to rotatably support an end of the ball screw; A moving block coupled to the ball screw and movable along the longitudinal direction of the ball screw when the ball screw rotates; At least one rail provided on an upper surface of the support plate to guide the movement of the movable block; An intersecting block coupled to the moving block and freely moving in a direction crossing the moving block; And And a fixed part fixed at both ends to an upper surface of the cross block and a lower surface of the work stage. The method of claim 14, Each of the four moving support units, A plurality of protrusions protruding upward from an upper surface of the moving block and having through holes formed therein; And And a moving shaft movably coupled to the protruding portion so as to pass through the through hole, and at least a portion of which is fixed to the intersecting block. The method of claim 15, Ball screws respectively formed on the four moving support units are arranged in substantially the same direction as those arranged in the diagonal direction on the upper surface of the support plate, the motor provided in the moving support units disposed along the diagonal direction Printing apparatus characterized in that located in opposite directions to each other. The method of claim 11, A moving rotary part coupled to both sides of the blanket roll and configured to move and rotate the blanket roll to an upper surface of the work stage; And And a pair of gantry portions partially coupled to the moving rotation part to move together with the moving rotation part to the upper surface of the work stage, and spaced apart from each other in front of the blanket roll. The sensing unit is provided in each of the pair of gantry, the printing device, characterized in that coupled to the gantry to move along the longitudinal direction of the gantry. The method of claim 17, And the sensing unit includes an alignment camera for photographing an alignment mark formed on the substrate and transmitting the captured image information to the controller. The method of claim 11, And a height adjusting part coupled to the support plate to adjust a height of the support plate including the work stage. The method of claim 19, The printing apparatus of claim 1, further comprising at least one probe unit provided around the height adjusting unit to measure the lifting height of the support plate.

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